Any questions from newcomers on MQL4 and MQL5, help and discussion on algorithms and codes - page 961

[Igor Makanu]

Yevhenii Levchenko:

What do I have to say: does it happen and is it also due to some kind of cracks in the quotes or am I writing something wrong?

Do you want me to tell you that the MT4 tester is not working correctly? - You won't hear your screenshot with errors in ticks or bars - the tester will generate everything from any possible low TF

the developers have always answered questions like yours - write the codes correctly!

i showed you an example of how to write your code.... i can't see it, and it's not interesting :))) - busy, reading articles, I'll get to work on my codes

[Yevhenii Levchenko]

Igor Makanu:

Do you want me to tell you that the MT4 tester is not working correctly? - You won't hear your screenshot with errors in ticks or bars - the tester will generate everything from any possible low TF

the developers have always answered questions like yours - write the codes correctly!

i showed you an example of how to write your code.... i can't see it, and it's not interesting :))) - busy, reading articles, I'll get to work on my codes

Okay! Thank you

[Sergey Basov]

Yevhenii Levchenko:

Okay! Thank you

Might come in handy: https://www.mql5.com/ru/forum/165405#comment_5602248

[Azat0t]

Good afternoon, comrades. I'm learning to write simple things in mql4, now I'm trying to work with arrays. I can't understand the error in this piece of code:

   double d1 = NormalizeDouble(Low[iLowest(NULL, 0, MODE_LOW, MaxLimit, 0)],4);
   double d2 = NormalizeDouble(High[iHighest(NULL, 0, MODE_HIGH, MaxLimit, 0)],4);
   double CrossBarsNum[][2];
   for (double d = d1; d <= d2; d += 0.0001)
     {
       double a = 0.0;
       for(int i = 0; i < MaxLimit; i++)
           if(d > Low[i] && d < High[i])
               a+=1;
               CrossBarsNum[(d-d1)/0.0001,0] = d;
               CrossBarsNum[(d-d1)/0.0001,1] = a;

It's crashing on the last two lines with the wording integer expression expected. As far as I understood, an index in an array can be set using a formula. It is needed to search through the array strings and sequentially record the quotes and the number of bars containing such a quote. The formula gives an integer value (from 0 and higher in increments of one), so what is the error?

[Aleksey Vyazmikin]

Azat0t:

Good afternoon, comrades. I'm learning to write simple things in mql4, now I'm trying to work with arrays. I can't understand the error in this piece of code:

It's crashing on the last two lines with the wording integer expression expected. As far as I understood, an index in an array can be set using a formula. It is needed to search through the array strings and sequentially record the quotes and the number of bars containing such a quote. The formula returns an integer value (from 0 and higher in steps of one), so what is the error?

Make the array index an int type, not double. The array index should be an integer.

[Yevhenii Levchenko]

Sergey Basov:

Might come in handy: https://www.mql5.com/ru/forum/165405#comment_5602248

Thank you! I've pretty much always done that. After loading, I pressed "Refresh" - the quotes were different. I forgot that I had set time limit for robot's work. :)

[Alexey Viktorov]

Azat0t:

Good afternoon, comrades. I'm learning to write simple things in mql4, now I'm trying to work with arrays. I can't understand the error in this piece of code:

It's crashing on the last two lines with the wording integer expression expected. As far as I understood, an index in an array can be set using a formula. It is needed to search through the array strings and sequentially record the quotes and the number of bars containing such a quote. The formula returns an integer value (from 0 and higher in steps of one), so where is the error?

Use an explicit type conversion

               CrossBarsNum[int((d-d1)/0.0001),0] = d;
               CrossBarsNum[int((d-d1)/0.0001),1] = a;

[Azat0t]

Thanks, I fixed the error, but still no result: the array doesn't fill up. What can this be connected to?

   int handle;
   handle = FileOpen("FindLevels.txt", FILE_CSV|FILE_WRITE, '\t');
   double d1 = NormalizeDouble(Low[iLowest(NULL, 0, MODE_LOW, MaxLimit, 0)],4);
   double d2 = NormalizeDouble(High[iHighest(NULL, 0, MODE_HIGH, MaxLimit, 0)],4);
   double CrossBarsNum[][2];
   for (double d = d1; d <= d2; d += 0.0001)
     {
       double a = 0.0;
       for(int i = 0; i < MaxLimit; i++)
           if(d > Low[i] && d < High[i])
               a++;
               CrossBarsNum[int((d-d1)/0.0001),0] = a;
               CrossBarsNum[int((d-d1)/0.0001),1] = d;
     } 
   FileWrite(handle, CrossBarsNum[11,1], d, d1, d2, a, ArraySize(CrossBarsNum));
   //FileWriteArray(handle, CrossBarsNum, 0, WHOLE_ARRAY);
   FileClose(handle);
   return(0);

Variables d, d1, d2 work exactly

[Artyom Trishkin]

Azat0t:
Thanks, I fixed the error, but still no result: the array is not filled. What can this be connected to? Variables d, d1, d2 work exactly

Your array size is always zero in the first dimension. I didn't see ArrayResize() anywhere

[Alexey Viktorov]

Azat0t:
Thanks, I fixed the error, but still no result: the array is not filled. What can this be about? Variables d, d1, d2 work exactly

Don't forget to put

#property strict

Fix all the errors and maybe everything will work out. Learn to use the debugger. With step-by-step execution all problems are revealed.